Although the FDA has approved several types of laser for permanent hair reduction, results can vary. An individual’s metabolism, hormonal level, hair quality and number of hair follicles can all affect the outcome.
Moreover, normal hair goes through a growth cycle in three stages: the anagen, or growing phase; the telogen, or resting phase; and the catagen, or transitional phase. During the anagen phase, hair is susceptible to the lasers energy, but during the telogen and catagen phases, it is resistant.
At any one time, various percentages of body hair will be in each of these phases, making complete removal unlikely without multiple sessions.Typically five treatments are necessary to achieve the desired result.